The Collaborative International Dictionary
Unfruitfully
Unfruitful \Un*fruit"ful\, a. Not producing fruit or offspring; unproductive; infertile; barren; sterile; as, an unfruitful tree or animal; unfruitful soil; an unfruitful life or effort. -- Un*fruit"ful*ly, adv. -- Un*fruit"ful*ness, n.
Wiktionary
unfruitfully
adv. In an unfruitful manner